Break out the handcuffs! "50 Shades! The Musical," a cheeky musical parody of the infamous "Fifty Shades of Grey" book and its two sequels, has taken over San Francisco's Marines' Memorial Theatre with its raunchier-than-thou high jinks.

This giddy, 85-minute spoof of E.L. James' blockbuster trilogy -- which runs through Sunday -- doesn't take anything seriously, which is a considerable relief. While the novels elicited groans from many a critic with over-the-top depictions of the lures of S&M, the silly-on-steroids musical mocks all that moaning and shuddering big time.

Vigorously directed by Al Samuels, the titillating tuner spins around 11 original songs, including "They Get Nasty" and "I Don't Make Love" and "There's a Hole Inside of Me." Prepare yourself for so much simulated sex you lose count, more F-words than a Mamet play and an anything-goes attitude toward smut of all stripes.

Suffice to say there is very little of this tour-de-filth that can be quoted in a family newspaper. Among the clever little rhymes that whiz past amid the naughtiness: "rufi" and "aloofy."

Sondheim, it isn't.

But if you are among the legions of book club devotees who devoured this series, the trashy little musical is bound to tickle you. If you are not familiar with the plot of the books, you may find yourself wondering what all the fuss is about.

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Sitting amid the throngs of fans squealing with laughter, it seems clear that the relationship you bring to the production greatly impacts your level of enjoyment. It's something of a cult hit in that sense, like "Rocky Horror" for the girls-night-out set. Apparently, the ladies who got lathered up over these novels (we're talking 32 million copies sold!) are now screaming for more.

Still, there's no denying the kinky-meets-camp appeal of the parody. One of the funniest shticks to hit the fan is the take on the Adonis billionaire Christian Grey (Chris Grace), the cad who corrupts our virginal heroine Anastasia Steele (Amber Nicole Petty.) Here, Grey is played by a stout Asian fellow with a beer belly the size of Lake Michigan. Grey leads Steele down the rabbit hole to the land of bondage, pain and sex slavery -- and she loves every minute of it.

Petty gives the straight-laced Anastasia some pizazz, and Grace is a certainly scene-stealer as the portly paramour who has a penchant for whips and chains but won't let himself be touched. Their interludes are punctuated by asides from a Greek chorus of pickled book-club ladies who like to read the books aloud ... in the shower.

Subtlety is not the strong suit here, and the show would be a tad zingier if there were no intermission to slow things down. Sometimes less is more, especially when the splattering of bodily fluids is involved. The bit parts of the book club ladies would also be funnier if they were more fleshed out (although Jessica Kemock is hilarious as the mousy sad sack Carol).

Theater mavens may also enjoy the Broadway winks and nods (from "Phantom" to "Les Miz") more than the recurring references to "mommy porn" but then, perhaps, erotic is in the eye of the beholder.